Rockwell Automation DAG6.5.8 APPLICATION GUIDE SCADA SYSTEM - Manual (Page 48)

Publication AG-UM008C-EN-P - February 2005
2-10 Configuring Enhanced PLC-5 Processors
Figure 2.3 is an example of a station list containing three stations:
octal addresses 10, 3, and 12. Station 12 is being polled.
Figure 2.3 Example Station List
Monitor Active Stations
To see what stations are active, view the active station file. Each bit in
the file represents a station on the link. The stations are numbered in
order as a continuous bit-stream file starting with the first bit in the
first word (Figure 2.4).
Figure 2.4 Example Active Station File
For PLC-5 processors:
total number
of stations
pointer showing the station
address being polled
address of first
station in list address of second
station in list address of third
station in list
Starting with these PLC-5
firmware revisions This is what you will see
Series E/Revision B
Series D/Revision C
Series C/Revision L
Series B/Revision M
Series A/Revision M At power-up or after reconfiguration, the master
station assumes that all slave stations are
inactive (bit=0).
For all prior firmware revisions At power-up or after reconfiguration, the master
station assumes that all slave stations are active
(bit=1) and the station displays inactive only after
it fails to respond to a poll packet.
Address 15 Data 0
B11:0 1111 1111 1111 1111 Remote station 0
B11:1 1111 1111 1111 1111 Remote station 16
10
B11:2 1111 1111 1111 1111